[30]“Useful Birds and Their Protection,” E. H. Forbush, page 166.
[31]“Useful Birds and Their Protection,” by E. H. Forbush, pages 161, 162, 163.
[32]“Useful Birds and Their Protection,” by E. H. Forbush, pages 161, 162, 163.
[33]From Witmer Stone in Educational Leaflet No. 50, National Association of Audubon Societies.
[34]Farmers’ Bulletin 755, U. S. Dept. of Agriculture, Biological Survey.
[35]From Witmer Stone, in Educational Leaflet No. 50, National Association of Audubon Societies.
[36]From Eaton’s “Birds of New York.”
[37]From “Useful Birds and Their Protection,” by E. H. Forbush.
[38]Bulletin No. 37, U. S. Dept. of Agriculture, Biological Survey.
[39]From “Useful Birds and Their Protection,” by E. H. Forbush, pages 245, 246, 252, 253.